Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/9905
DC Field | Value | Language |
---|---|---|
dc.contributor.authorall | Villa, G.; Univ Parma | en |
dc.contributor.authorall | Fioroni, C.; Univ Parma | en |
dc.contributor.authorall | Persico, D.; Univ Parma | en |
dc.contributor.authorall | Roberts, A. P.; Australian National University | en |
dc.contributor.authorall | Florindo, F.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
dc.date.accessioned | 2015-06-12T08:16:50Z | en |
dc.date.available | 2015-06-12T08:16:50Z | en |
dc.date.issued | 2014 | en |
dc.identifier.uri | http://hdl.handle.net/2122/9905 | en |
dc.description.abstract | During the Eocene-Oligocene transition, Earth cooled significantly from a greenhouse to an icehouse climate. Nannofossil assemblages from Southern Ocean sites enable evaluation of paleoceanographic changes and, hence, of the oceanic response to Antarctic ice sheet evolution during the Eocene and Oligocene. A combination of environmental factors such as sea surface temperature and nutrient availability is recorded by the nannofossil assemblages of and can be interpreted as responses to the following changes. A cooling trend, started in the Middle Eocene, was interrupted by warming during the Middle Eocene Climatic optimum and by short cooling episodes. The cooling episode at 39.6Ma preceded a shift toward an interval that was dominated by oligotrophic nannofossil assemblages from ~39.1 to ~36.2Ma.We suggest that oligotrophic conditions were associated with increased water mass stratification, low nutrient contents, and high efficiency of the oceanic biological pump that, in turn, promoted sequestration of carbon from surface waters, which favored cooling. After 36.2Ma, we document a large synchronous surface water productivity turnoverwith a dominant eutrophic nannofossil assemblage that was accompanied by a pronounced increase in magnetotactic bacterial abundance. This turnover reflects a response of coccolithophorids to changed nutrient inputs that was likely related to partial deglaciation of a transient Antarctic ice sheet and/or to iron delivery to the sea surface. Eutrophic conditions were maintained throughout the Oligocene, which was characterized by a nannofossil assemblage shift toward cool conditions at the Eocene-Oligocene transition. Finally, a warm nannofossil assemblage in the Late Oligocene indicates a warming phase. | en |
dc.language.iso | English | en |
dc.relation.ispartof | Paleoceanography | en |
dc.relation.ispartofseries | 3/29 (2014) | en |
dc.subject | Souther Ocean, Eocene-Oligocene | en |
dc.title | Middle Eocene to Late Oligocene Antarctic Glaciation/Deglaciation and Southern Ocean productivity | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 223–237 | en |
dc.subject.INGV | 04. Solid Earth::04.04. Geology::04.04.08. Sediments: dating, processes, transport | en |
dc.subject.INGV | 04. Solid Earth::04.04. Geology::04.04.10. Stratigraphy | en |
dc.subject.INGV | 04. Solid Earth::04.05. Geomagnetism::04.05.06. Paleomagnetism | en |
dc.subject.INGV | 04. Solid Earth::04.05. Geomagnetism::04.05.07. Rock magnetism | en |
dc.identifier.doi | 10.1002/2013PA002518 | en |
dc.description.obiettivoSpecifico | 1A. Geomagnetismo e Paleomagnetismo | en |
dc.description.obiettivoSpecifico | 4A. Clima e Oceani | en |
dc.description.obiettivoSpecifico | 2IT. Laboratori sperimentali e analitici | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | restricted | en |
dc.relation.issn | 0883-8305 | en |
dc.contributor.author | Villa, G. | en |
dc.contributor.author | Fioroni, C. | en |
dc.contributor.author | Persico, D. | en |
dc.contributor.author | Roberts, A. P. | en |
dc.contributor.author | Florindo, F. | en |
dc.contributor.department | Univ Parma | en |
dc.contributor.department | Univ Parma | en |
dc.contributor.department | Univ Parma | en |
dc.contributor.department | Australian National University | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia, Sezione Roma2, Roma, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | restricted | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | Departimento di Scienze della Terra, Universita di Parma, Parco Aeres delle Scienze, 157 Parma, Italy | - |
crisitem.author.dept | Univ Parma | - |
crisitem.author.dept | National Oceanography Centre, University of Southampton, European Way, Southampton SO14 3ZH, UK | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione AC, Roma, Italia | - |
crisitem.author.orcid | 0000-0001-5194-9724 | - |
crisitem.author.orcid | 0000-0002-6058-9748 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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Villa_paleoceanography.pdf | main article | 2.37 MB | Adobe PDF |
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